ed_code
get the code list of country, currency, stock exchange, commodity exchange and administrative district of mainland of China.
ed_code(cate = NULL)
The available category values including 'country', 'currency', 'stock_exchange', 'commodity_exchange', 'china_district'.
if (FALSE) {
# specify the categories
code_list1 = ed_code(cate = c('country', 'currency'))
# interactivly return code list
code_list2 = ed_code()
}